package com.zzyl.framework.interceptor;

import cn.hutool.core.map.MapUtil;
import cn.hutool.core.util.ObjectUtil;
import com.zzyl.common.utils.StringUtils;
import com.zzyl.common.utils.UserThreadLocal;
import com.zzyl.framework.web.service.TokenService;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class MemberInterceptor implements HandlerInterceptor {

    @Autowired
    private TokenService tokenService;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        // 如果不是Controller层的请求，直接放行
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }

        //1.获取header中的token
        String token = request.getHeader("authorization");
        //2.判断获取到的token是否为空，为空则响应401
        if (StringUtils.isEmpty(token)){
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        //3.不为空，则进行解析token
        Claims claims;
        try {
            claims = tokenService.parseToken(token);
        } catch (Exception e) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        //4.如果解析失败，响应401
        if (ObjectUtil.isEmpty(claims)){
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        //5.解析成功之后，获取数据,如果数据为null，放回401
          Long userId = MapUtil.getLong(claims, "userId");
        //6.如果解析成功之后的数据是否为空，则响应401
        if (ObjectUtil.isEmpty(userId)){
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            return false;
        }
        //7.将解析成功之后的数据存储到ThreadLocal中
        UserThreadLocal.set(userId);
        //8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //清除ThreadLocal中的数据
        UserThreadLocal.remove();
    }
}
